Year 11 - Science
Controlling water balance: the kidneys, and treating kidney failure
Coordination and control: maintaining a constant internal environment
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers the importance of maintaining a constant internal environment, focusing on body temperature control, osmotic balance, and kidney function. It explains the roles of the skin, kidneys, and ADH, and emphasises data extraction, experiment techniques, and accurate data interpretation.
Lesson Summary
You will learn to describe the role of the kidneys in filtering the blood to control the water balance of the human body, and treatments for kidney failure.
Key Notes
- The kidneys are organs of the human excretory system; blood passes through the kidneys and is filtered.
- Water and urea diffuse out of the blood plasma into kidney tubules to be excreted as urine.
- The kidneys reabsorb as much water as needed from the urine into the blood plasma to maintain water balance in the body.
- Having too much water in the body leads to dilute urine, and vice versa.
- What happens during kidney failure and ways it can be treated.
Vocabulary To Learn
- urea: a waste product created in the process of breaking down excess proteins and amino acids
- blood plasma: the liquid part of the blood which contains dissolved nutrients and waste products
- kidney: the organ in the excretory system which filters waste products from blood plasma and controls water balance
- excretory system: the organ system responsible for removing waste from blood plasma
- urine: a combination of waste urea, water and other substances which is stored in the bladder until urinated
Common Mistakes To Avoid
- Misconceptions about the roles of the kidneys, bladder and how the blood is 'cleaned' exist. Students often conflate/confuse these roles, muddle key terms or offer weak descriptions or explanations.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The kidneys are organs of the human excretory system; blood passes through the kidneys and is filtered. Water and urea diffuse out of the blood plasma into kidney tubules to be excreted as urine.
2. Define this scientific word and use it in context. 'urea'
a waste product created in the process of breaking down excess proteins and amino acids. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Misconceptions about the roles of the kidneys, bladder and how the blood is 'cleaned' exist. Students often conflate/confuse these roles, muddle key terms or offer weak descriptions or explanations. Correction: The roles of the kidney and bladder are clearly described, and diagrams and flowcharts are used to support the detailed explanations. Tasks that reinforce understanding and check for clarity and correct use of key words are included too.
More Lessons In This Unit
- Controlling water balance: the kidneys, and nephron structure Study Guide
- Controlling water balance: the kidneys, nephron structure and kidney failure Study Guide
- Effect of osmosis and sugar concentration on the mass of plant tissue: analysis Study Guide
- Effect of osmosis and sugar concentration on the mass of plant tissue: practical Study Guide
- The importance of maintaining constant conditions in the body Study Guide
- The importance of maintaining constant conditions in the body, including osmosis Study Guide
- The role of the nervous system in thermoregulation Study Guide
- The role of the skin in thermoregulation Study Guide
- The roles of the nervous and endocrine systems in controlling water balance Study Guide
- Using a microscope to observe effects of osmosis in plant cells: practical Study Guide
Browse all guides in the Year 11 Science guide library.